我最近将一个现有的rails 3.2.3应用程序迁移到rails 4.0.0.rc2。我做了所有必要的修改，并且能够使它在我的本地工作正常。但是当我把它推到heroku时 - ＆＃34; git push heroku master＆＃34 ;,它说没有推出一些参考。接下来是堆栈跟踪 -
- - - - ＆GT;编写config / database.yml以从DATABASE_URL读取
-----＆GT;为Rails资产管道准备应用程序
正在运行：rake assets：预编译
耙子流产了！
无法连接到服务器：连接被拒绝
服务器是否在主机上运行＆＃34; 127.0.0.1＆＃34;并接受
端口5432上的TCP / IP连接？
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:825:in initialize'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:825:in new＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:825:in connect'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:542:in初始化＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in new'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/postgresql_adapter.rb:41:in postgresql_connection＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:440:in new_connection'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:450:in checkout_new_connection＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in acquire_connection'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:356:in结账时阻止＆＃39 ;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:355:in checkout'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:265:in阻止连接＆＃39 ;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:264:in connection'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_adapters/abstract/connection_pool.rb:546:in retrieve_connection＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_handling.rb:79:in retrieve_connection'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/connection_handling.rb:53:in connection＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activerecord-4.0.0.rc2/lib/active_record/model_schema.rb:203:in table_exists?'
/tmp/build_uqaojzpp3n68/lib/custom_active_record/domain_constants_pool.rb:13:in evaluate_constants＆＃39;
/tmp/build_uqaojzpp3n68/app/models/user_type.rb:4:in <class:UserType>'
/tmp/build_uqaojzpp3n68/app/models/user_type.rb:1:in＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in require'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in阻止在需要＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in load_dependency'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in要求＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:329:in require_or_load'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:462:in load_missing_constant＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:183:in const_missing'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:494:in load_missing_constant＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:183:in const_missing'
/tmp/build_uqaojzpp3n68/app/models/user.rb:13:in＆＃39;
/tmp/build_uqaojzpp3n68/app/models/user.rb:1:in <top (required)>'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in要求＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in block in require'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in load_dependency＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in require'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:329:in require_or_load＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:462:in load_missing_constant'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:183:in const_missing＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/inflector/methods.rb:226:in const_get'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/inflector/methods.rb:226:in阻止constantize＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/inflector/methods.rb:224:in each'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/inflector/methods.rb:224:in注入＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/inflector/methods.rb:224:in constantize'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:534:in get＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:565:in constantize'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise.rb:274:in get＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/mapping.rb:77:in to'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/mapping.rb:72:in modules＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/mapping.rb:89:in routes'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/mapping.rb:156:in default_used_route＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/mapping.rb:66:in initialize'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise.rb:308:in new＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise.rb:308:in add_mapping'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/rails/routes.rb:208:in阻止在devise_for＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/rails/routes.rb:207:in each'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/devise-3.0.0.rc/lib/devise/rails/routes.rb:207:in devise_for＆＃39;
/tmp/build_uqaojzpp3n68/config/routes.rb:55:in block in <top (required)>'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.0.rc2/lib/action_dispatch/routing/route_set.rb:316:in instance_exec＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.0.rc2/lib/action_dispatch/routing/route_set.rb:316:in eval_block'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/actionpack-4.0.0.rc2/lib/action_dispatch/routing/route_set.rb:294:in draw＆＃39;
/tmp/build_uqaojzpp3n68/config/routes.rb:1:in <top (required)>'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:222:in loading＆＃39;
//t {/ 1}} load_dependency＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:222:in block in load'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in阻止在load_paths＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:40:in load'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:40:in load_paths＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:16:in each'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:40:in阻止更新程序＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/file_update_checker.rb:75:in reload!'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:26:in执行＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:27:in call'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/file_update_checker.rb:75:in execute_if_updated＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/finisher.rb:69:in updater'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application/routes_reloader.rb:6:in instance_exec＆＃39;
在run_initializers＆＃39;中的/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in block in <module:Finisher>'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:30:in阻止
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:54:in run'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/initializable.rb:55:in初始化！＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/railtie/configurable.rb:30:in run_initializers'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application.rb:215:in＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in method_missing'
/tmp/build_uqaojzpp3n68/config/environment.rb:5:in阻止在需要＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:213:in require'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in要求＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/railties-4.0.0.rc2/lib/rails/application.rb:189:in load_dependency'
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/activesupport-4.0.0.rc2/lib/active_support/dependencies.rb:228:in阻止在run_tasks_blocks＆＃39;
/tmp/build_uqaojzpp3n68/vendor/bundle/ruby/2.0.0/gems/sprockets-rails-2.0.0/lib/sprockets/rails/task.rb:54:in在定义＆＃39;中的块（2级）
任务：TOP =＆gt;环境
（通过使用--trace运行任务查看完整跟踪）
！
！预编译资产失败。
！
！推送被拒绝，无法编译Ruby / Rails app
我也在我的本地使用postgres，它的工作正常。此应用程序以前部署在heroku上。我在Gemfile中添加了ruby 2.0.0，日志表明他们使用的是ruby 2.0.0。我不知道如何调试这个。将heroku上的现有应用程序迁移到4.0是否需要进行任何其他更改。 任何帮助，将不胜感激。 提前谢谢。